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I have a Fryer CNC bedmill w/ a Centroid M-400 contriller onit. I have had trouble tapping on it even though it has a tapping cycle. I can't seem to figure out the dwell very good. What is the best way to tap on a CNC like this, tension& compression or reversing tapping head's? I just bought aTapmatic NSM-4 ten.& com. head, but I may send it back. Cananyone please help me? If so, please email me, thank you,Duane S.